File-cutting machine



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G. SCHMIDT. FILE CUTTING MACHINE.

Patented Dec. 5, 1893.

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FILE CUTTING MACHINE. No. 509,949. Patented Dec. 5,1898.

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FILE OUTTING MACHINE. No. 509,949. Patented Dec. 5, 1893.

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. FILE CUTTING MACHINE.

No. 509,949. Patented Dec. 5, 1893.

0 v V O UNITED STATES PATENT OFFICE.

GUSTAV SCHMIDT, OF AMMENDORF-RADEVVELL, GERMANY, ASSIGNOR TO FRIEDRICHSCHMIDT, OF BROOKLYN, NEWV YORK.

FILE-CUTTING MACHINE.

SPECIFICATION forming part of Letters Patent No. 509,949, dated December5, 1893.

Application filed November 10, 1892. Serial No. 451,511- (No model.)

To all whom it may concern.-

Be it known that I, GUSTAV SCHMIDT, a subject of the Emperor of Germany,residing at Ammendorf-Radewell, near Halle-on-the- Saale, Saxony, in theEmpire of Germany, have invented a certain new and useful Improvement inFile-Cutting Machines, of which the following is a specification.

I vary the feed, and consequently the distance between the severalteeth, by employing an adjustable eccentric with means for readilycontrolling it. I have devisedan arrangement of springsand lever, andprovisions for conveniently adjusting the latter whereby to vary theforce of the blow. I clamp and.

release the file by the same movement which starts and stops themachine. I employ an arrangement of the mechanism which brings the crankand its connecting link close tothe hammer-bar.

The accompanying drawings form a part of this specification andrepresent what I consider the best means of carrying out the invention.

Figure 1 is a side elevation; Fig. 2 a plan View, and Fig. 3 an endelevation. views all show the machine with one chisel or file in place.resent portions on a larger scale. Fig. 4 is a View corresponding toFig. l, but with certain portions in section. section in the plane ofthe axis of the main shaft. Fig. 6 is anelevation as seen at rightangles to the view in Fig. 5. Figs o and 6 show a file in position.These figures show a slight modification in having the clamping barvertical instead of inclined. Fig. 7 is an elevation corresponding toFig. 3 but partly in section. Fig; 8 is a plan view partly in horizontalsection on the plane of the axis of the main shaft. Fig. 9 is a verticalsection on the line 9-9 inFig. 7.

Similar lettersof reference indicate corresponding parts in all thefigures where they appear.

A is a stand of cast iron." B isa shaftsup ported in fixed bearings inthis stand, and rotated by a belt running on the pulley B, and steadiedby a fiy-wheel B which revolves in an aperture in the stand.

B is a cam carried on the shaft, adapted to These The remaining figuresrep-.

Fig. 5 is avertical lift the hammer and to leave it free to fall atregular short intervals.

D is the hammer-bar, mounted in bearings formed in fixed arms A, Aicaston the stand A. An arm D, firmly secured in an adjustable position onthis bearing, extends longitudinally toward and is guided by aslide-wayA on the stand. The cam acts on this arm D through a screw D whichallows of fine adjustment. The arrangement allows the cam to act veryclosely to the central line of the ham nier-bar.

The upper portion of the hammer-bar D is of less diameter and playseasily through a hole in a block E, which is provided with horizontaltrunnions E, E, engaged in slots f in a hollow lever F. One end of thislever is pivoted in a fixed post A; the other endis connected by a pin Fto a rod G which is tapped through a nut I-I, free to revolve in anextension of the arm A and may be turned by a hand-wheel H. At a higherpoint this rodG is guided in an extension of the arm A.

The hammer-barD extends above the block E, and is provided with a nut Dand a jam-nut The height of the block E, and consequently of theposition at which the hammer-bar seeks to come to rest, may be raisedand lowered by turning the hand-wheel H. The operator can by this meansvary the force of the blow in either direction, and as often as requiredduring the progress of the work. K is the anvil or carriage, having asemicylindrical lower face, mounted in an inclined channel ofcorresponding cross-section. The anvil is traversed by a screw L,provided with a ratchet-wheel L which is revolved step by step, and isconnected with the anvil through a split nut K and yoke K which latteris fitted in a transverse groove in the lower side of the anvil. Thescrew is turned a little at I each lifting motion of the ham mer-bar.The

extent to which it is turned, and consequently the extent to which theanvil and the file X carried thereon are moved between each cut, can bevaried, as follows:

A lever L1 is loosely mounted on the screw L, and is provided withaspring pawl N which engages in the teeth of the ratchet. This arm isconnected by a link 0 with the lever P turning on the center A carriedon a fixed portion of the stand A. The other extremity of the lever Pbears by a roller P against an adjustable eccentric cam which is in twoparts, one part firmly bolted to the wheel B and the other part, Badjustably connected by holding bolts B and an endless adjusting screwB, which latter is mountedin the wheel B By turning this screw andvarying the position of the part B I can vary the throw of the camwithin wide limits. The form of the cam is approximately eccentric, andthe provisions for actuating the lever P may be designated as anadjustable eccentric. When it is desired to turn the screwLso as to makethe file coarser, the screw B should be turned in the direction toincrease the throw of the eccentric. When it is desired to make the filefiner, by putting the cuts nearer together, the screw 13 is turned toreduce the throw of the eccentric B".

Q is a screw which is mounted in one of the bearings, and can beemployed to resist the turning of the screw L with any required degreeof force to avoid its ever turning backward.

So soon as the cutting of one face of a file is completed the machine isstopped and the blank is unclamped and taken out and turned over, andthe anvil carrying the file being returned again to its startingposition the work is again resumed. The frequent startings and stoppingsare effected by means of a friction-clutch engaged in one side of thepulley B. When this clutch is relaxed, the pulley B turns idly and themachine is stopped.

R is a shaft operated by a hand-wheel R, having a scalloped periphery tofacilitate grasping and turning it, and carrying an endless screw Rwhich latter engages in a wormsegment S, carrying a clamp S adapted tobe partially revolved on the bolt T on which it is mounted. The entirebolt T with its clamp S is raised and lowered in the act of starting andstopping the machine, it being lowered to clamp the file by the samemotion which starts the machine, and being raised toliberate the file bythe reverse motion.

, U is a frustum of a cone feathered on the, shaft B so that it iscompelled to turn therewith, but may be moved endwise. It is engaged bya half-ring U, fitting in a groove extended around and trunnioned in alever U turning on a fixed center at A. The lower end of this lever isconnected by a link U to a lever V which turns freely onv the up rightor nearly upright cylindrical bolt or slide T. This bolt is guidedinfixed bearings A and A and is capable of rising and sinking. It isdepressed by a spiral spring WV abutting against the upper bearing A andpressing downward on a collar T which is secured on the bolt T bypinching-screws T The under side of this collar has a cavity or recess15 which nearly coincides in form with the cam V, but it is a littlelonger. The lever V may be turned in one direction and the other simplymoving its cam V in I the cavity 15 without raising the bolt T, but whenthis lever is fully turned in the direction to disengage thefriction-clutch U and cause the machine to stop, the cam V is moved outof the recess 25, and by acting under the plane lower face of the collarT will lift the bolt T in opposition to the force of the spring W. Thearm T carries a clamping surface S which is adapted to press on thefile-blank X and hold it firmly. When the machine is working, the leverV is in such position that the cam V is received in the recess t and theclamp S presses on the file-blank with the full force of the spring \V.To stop the machine the operator turns the lever V, and the singlemovement acts through the leverU and disengages the clutch U, and alsoacts by its cam V to lift the bolt T, and consequently the clamp S andliberate the file-blank X.

The engagement of the anvil K with the two-part nut K, which traversesit step by step longitudinally, is effected through an arm or yoke Kwhich is curved, as clearly shown in Fig. 9, and engages in a transversegroove 'extended'around the anvil so as to compel the anvil to travellongitudinally with the arm and the divided nut but to allow the anvilto be partly rotated on its axis. Such rotation may be effected by theattendant at will, and is especially important in cutting round and whatare known as half-round files, allowing the blank to be presented so asto receive the cuts at any angle required in the several traverses ofthe blank through the machine. It is also useful in cutting the flatfaces of files by allowing the depth of cut across the face to beincreased on one edge and diminished on the other at will. This may becontrolled by changing the position of the clamp S so as to aid inholding the file very exactly in the position required. The clamp iscapable of partially revolving on the horizontal pivot T and has asegment S on its upper side which is engaged by an endless screw Rcontrolled by the hand-wheel R, by turning which latter the angle atwhich the clamp will press on the file may be varied and the file andanvil correspondingly held so as to insure a uniform cut across thefile.

I claim as my invention- 1. In a file-cutting machine the changeable camB and adjusting screw 13 carried on the shaft B, in combination withconnections as a lever P, link 0, lever M, pawl N and screw L, forfeeding forward the carriage K,

and with means as the clamp T for firmly holding the file blank on suchcarriage, and with the hammer-bar D carrying a suitable cutter, and withoperating means therefor, all arranged for joint operation substantiallyas herein specified.

2. In afile-cutting machine, the two springs I and J, in combinationwith each other, and with the block E and ham mer-bar D, and with meansfor operating the latter, to varying extents all arranged for jointoperation substantially as herein specified.

3. In a file-cutting machine, the two springs I and J, in combinationwith each other and with the hammer-bar D, lever F, block E trunnionedthereon, rod G and nut H with its hand-wheel H, all arranged for jointoperation substantially as herein specified.

4E. In a file-cutting machine, the lever V, carrying the cam V and clampS operated by said cam, in combination with the connection U to the.lever U operating a friction-clutch U for starting and stopping themachine, all arranged for joint operation substantially as hereinspecified.

5. In a file-cutting machine, the anvil K, capable of being partiallyrevolved at will, and provisions for feeding it forward as required tograduate cuts, in combination with the yoke K carried by the feed-screwL, and 30

